Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 27,622	$ 39,910	$ 116,083	$ 136,033
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	41	3,470	(1,330)	3,439
Total other comprehensive loss	41	3,470	(1,330)	3,439
COMPREHENSIVE INCOME	$ 27,663	$ 43,380	$ 114,753	$ 139,472